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The Architectural Products Company

Wind Load Capacity

In getting your new windows in Columbus there are many things that will impact the quality and desirability of the window. This includes aesthetics and design, of course. It also includes efficiency ratings, which will impact comfort levels in the home and heating and cooling costs. But one factor that is less discussed today (which should not be the case) is the wind load capacity of a window. Unfamiliar with the term? Let our team fill you in on the details.

APCO is dedicated to offering clients the best in reliable services and products. As part of this we go through great effort to ensure our windows are all ENERGY STAR® rated and provided by leading, trusted manufacturers. We understand the importance of wind load capacity, heat gain, and more, and we want to ensure you do as well!

The force on a structure arising
from the impact of wind.

What Is Wind Load Capacity in a Window?

The wind load of a window, often also referred to as the Design pressure or DP is the load that a window can withstand in a measurement of wind. The pounds per square inch of pressure a window can deal with. Essentially this boils down to simply how much wind, or how high the pressure of wind, a  window can handle and remain fully functional.

A higher rating means the window can take on more wind load without incurring common forms of damage or performance drops. As an example, an “average” wind load resistance rating for a window is about 119 mph wind resistance, while a top-end window might boast resistances of 170 or above.

It’s important to keep in mind that finding your ideal DP rating is about finding what works for you. Many homes will never encounter wind pressures of even 110, and thus opting for the highest rating can be somewhat of an unnecessary investment. However, you do want a high enough rating to counter even the possibility of a problem. That’s why at APCO we typically suggest and offer windows with a wind-load rating of 143 mph.

Balancing Wind Load with Energy-Efficiency

The conundrum one faces here is that there are many factors that impact the strength of a window, including:

  • Internal window chambers and bends. Chambers and bends used in window design can have a considerable impact on strength and wind/snow resistances.
  • Walls. Multiple walls within a window add a layer of defense for each wall, which is why single-wall windows aren’t frequently seen in higher quality windows.
  • Reinforcement. The use of design reinforcement, of course, is an excellent way to add strength. And by choosing the right material, you can gain this without losing efficiency.

A common trouble in balancing these things is that metal reinforced windows tout some of the highest resistances. However they also can cost you a lot in efficiency, generating a lot of excess heat gain that can create discomfort and higher costs in a home. This is why higher quality manufacturers have moved to using fiberglass and vinyl reinforcement.


“My new windows and patio door are beautiful. The service from showroom to installed product was excellent. I also feel, through shopping comparisons that I received good value for my investment.” – Susan from Columbus

APCO is driven to bring you the best window products and the best window installation service possible. We offer the best window products and high quality window installation services throughout the following cities and their surrounding areas: Bexley, Columbus, Dublin, Gahanna, Grove City, Lewis Center, Pickerington, Powell, Reynoldsburg, Upper Arlington, and Westerville.

For a quote or to schedule service for the best window installation in the Columbus area, contact us today »

* A minimum purchase is required. The discount applies to the retail list price and is not available on all products. Valid for a limited time and only for homeowner replacement customers who purchase APCO products for their residence and have them installed by APCO via the same contract. Not valid with any other offer or promotion. Repairs/handyman service, repairs to existing products including parts, and James Hardie and Mavin products excluded. Prior sales excluded. Other restrictions may apply. Loans provided by GreenSky (1797 Northeast Expressway NE Suite 100 Atlanta, GA 30329) on approved credit, repayment terms vary from 24 to 132 months. 16.93% fixed APR, effective as of July 1st, 2014, subject to change. Interest is billed during the promotional period, but all interest is waived if the purchase amount is paid in full within 12 months. There are no required minimum monthly payments during the promotional period.
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